Small-part presence in fixtures
Confirms a 3 mm pin is seated before clamping.
Photoelectric · Ultra-compact
LMG2 Ultra-Compact Photoelectric Sensor
A 20 mm-class sensor with a 1 ms response: background-suppressed diffuse at 30 and 120 mm, retro-reflective at 2.5 m and through-beam at 2.5 m, all IP65.
Model LMG2-MB03 / MB12 / MJ200 / MT200 · Brand LE Raun · Category: Photoelectric Sensors
Range30 mm – 2.5 m
Response≤1 ms
Spotφ3 mm at 30 cm
ProtectionIP65
Overview
The LMG2 exists for the space between a 12 mm barrel and a full-size square sensor. At 1 ms response with a φ3 mm spot it is precise enough for small-part detection, and the visible red beam makes alignment possible without a target in place — a practical detail when the sensor is buried inside a fixture.Four variants cover the usual requirements: two background-suppressed diffuse models for detecting a part against whatever is behind it, a retro-reflective model reaching 2.5 m for cases where a reflector can be fitted, and a through-beam pair for the most reliable switching over the same distance.
Application scenarios
PCB detection
Senses board presence at the conveyor stop.
Robot end-effector verification
Confirms the gripper has actually picked a part.
Dispensing and filling
Detects the container rim at 30 mm.
Sorting chutes
Detects a part leaving the chute at 1 ms resolution.
Industries
- Electronics
- Automotive
- Semiconductor
- General machinery
Technical specifications
| Models | LMG2-MB03RN(P) · LMG2-MB12RN(P) · LMG2-MJ200N(P) · LMG2-MT200N(P) |
|---|---|
| Sensing method | Diffuse reflection BGS (MB) · retro-reflective (MJ) · through-beam (MT) |
| Sensing distance | 30 mm (MB03) · 120 mm (MB12) · 2,500 mm (MJ200) · 2,500 mm (MT200) |
| Sensing object | Opaque objects φ1 mm and above (MB) · φ2 mm and above (MJ / MT) |
| Output mode | NPN / PNP open-collector |
| Spot size | φ3 mm / 30 cm (φ3 mm / 120 cm on MB12, φ3 mm / 300 cm on MJ / MT) |
| Response time / frequency | ≤ 1 ms |
| Light source | 650 nm visible red light |
| Indicator | Red: lit when output active |
| Operating voltage | 12–24 V DC ±10% |
| Protection level | IP65 |
| Cable exit type | Cable-out type (standard 2 m) |
| Product application | Presence-absence detection, PCB board detection and other workpiece detection; suitable for various scenarios |
| Current consumption | ≤15 mA |
| Output current | ≤100 mA |
| Residual voltage | ≤1.5 V |
| Circuit protection | Short-circuit, reverse polarity, over-current |
| Ambient illumination | Incandescent ≤3,000 lux, sunlight ≤10,000 lux |
| Vibration / shock | 10–55 Hz 1.5 mm, 500 m/s² (X, Y, Z each 2 h) |
Dimensions
| Item | Value |
|---|---|
| Mounting holes | M3, 15 mm pitch |
| Cable | 2 m, 4-core |
Wiring & output
| Lead | Colour |
|---|---|
| 2 | Blue |
| 3 | Black |
| 4 | White |
| — | Grey (5-wire types) |
How to specify
- 01
Choose the detection mode
Through-beam for the longest range and the most reliable operation in dust; retro-reflective for one-sided wiring over a few metres; diffuse for colour-independent presence at short range; background suppression where the conveyor or the machine frame sits behind the target.
- 02
Check the target and the background
A diffuse sensor sees the target, not the gap: a dark matt object halves the range. Background suppression types are set by distance, so the background must be at least 20 % further away than the target.
- 03
Match the light spot to the part
A 10 mm spot on a 2 mm wire gives a weak, unstable signal; choose a lens with a small spot at the working distance, or switch to a laser type.
- 04
Decide the output and the housing
NPN for Asian PLC inputs, PNP for European; 4-wire when the PLC needs both states. Square plastic for general use, stainless for washdown, fibre-optic where the space is too tight.
Why this series
1 ms response, φ3 mm spot
Detects small parts precisely without the beam spreading over the fixture.
Visible red beam
Alignment is done by eye — no target, no oscilloscope.
Four detection methods at 2.5 m
Diffuse, retro-reflective and through-beam in the same 20 mm body.
Questions
How small an object can it see?
φ1 mm and above on the MB diffuse versions, φ2 mm on the retro-reflective and through-beam versions, at a 3 mm spot.
Is the visible beam a problem?
No — it is an advantage for alignment; the receiver still uses a modulated signal, so ambient light does not trigger it.
What does BGS mean?
Background suppression: the sensor switches on distance to the target, not on how much light returns, so a dark background does not cause a false trigger.
Need a quotation for LMG2 Ultra-Compact?
Send your application details or the guard opening dimensions and we will specify the right model and configuration for your machine.